CODEWITHSUNDEEP
blackberry
AK Joshi
AK Joshi

Reputation: 867

Uncaught exception no application instance

i am working on UI-application that handles multiple entry point approach.

I am referring the link and try for make a demo. Here is the code :-

public class DemoApp extends UiApplication implements  RealtimeClockListener
{

    private static DemoApp dmMain ;
    private static final long dm_APP_ID =  0x6ef4b845de59ecf9L;

    private static DemoApp getDemoApp()
    {
        if(dmMain == null)
        {
            RuntimeStore dmAppStore = RuntimeStore.getRuntimeStore();

            dmMain =  (DemoApp)dmAppStore.get(dm_APP_ID);
        }


        return dmMain;
    }

    private static void setDemoApp(DemoApp demoAppMain)
    {
        RuntimeStore dmAppStore = RuntimeStore.getRuntimeStore();
        dmAppStore.remove(dm_APP_ID);
        dmAppStore.put(dm_APP_ID, demoAppMain);
    }

    public static void main(String[] args) 
    {
        Log.d(" Application argument  "+args);

        if( args.length > 0 && args[ 0 ].equals( "Demo_Alternate" ) )
        {
            Log.d("Running Demo_Alternate #### Running Demo_Alternate #### Running Demo_Alternate");

            dmMain = new DemoApp();
            dmMain.enterEventDispatcher();

            setDemoApp(dmMain);
        }
        else
        {
            Log.d("Running Demo #### Running Demo #### Running Demo #### Running Demo");

            getDemoApp().initializeMain();
        }
    }

    public DemoApp() 
    {
        this.addRealtimeClockListener(this);
    }

    private void initializeMain() 
    {
        UiApplication.getUiApplication().invokeLater(new Runnable() 
        {
            public void run() 
            {
                try 
                {
                    pushScreen(new DemoMainScreen());

                } catch (Exception e) 
                {
                    Log.e(e.toString());
                }
            }
        });



    }

    public void clockUpdated() 
    {
        showMessage("DemoAppClock Updated");
        Log.d("DemoAppClock Updated #### DemoAppClock Updated #### DemoAppClock Updated");
    }


    private void showMessage(String message) 
    {
        synchronized (Application.getEventLock()) 
        {
            Dialog dlg = new Dialog(Dialog.D_OK, message, Dialog.OK, null, Manager.FIELD_HCENTER);
            Ui.getUiEngine().pushGlobalScreen(dlg, 1, UiEngine.GLOBAL_QUEUE);
        }
    }

    }

:- I have created an alternate entry point named Demo_Alternate , that runs at start up.
:- If the application has separate entry points, that means a separate process the link

Now my questions are :-

  1. While running the code, I am getting "Uncaught exception : no application instance".
  2. I just want to make one application instance - don't want separate processes.
  3. Can we use (Application) Singleton approach for alternate entry-points?

Upvotes: 0

Views: 327

Answers (2)

Nate
Nate

Reputation: 31045

I certainly agree with Peter, that calling setDemoApp(dmMain) after enterEventDispatcher() means it doesn't get called.

That said, I think you have a more basic misunderstanding here.

Using alternate entry points will create multiple processes. See here for more.

But, you say that you don't want separate processes. Can you tell us why not?

Separate BlackBerry processes that are designed to work together can still share data, using the RuntimeStore, for example.

Maybe you could tell us more about what your "Demo" and "Demo Alternate" are supposed to do.

Upvotes: 0

Peter Strange
Peter Strange

Reputation: 2650

Only looked briefly at this code, but see an obvious problem here:

      dmMain.enterEventDispatcher();
      setDemoApp(dmMain);

enterEventDispatcher never returns, so you never put your Application instance in RuntimeStore.

I suggest you review the following KB article, you might find its approach to accessing a RuntimeStore maintained object easier to use. Or not.

Singleton using RuntimeStore

Update

If this solution does not work, please update your original post with the corrected code.

Upvotes: 1

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